[1] : The Collaborative International Dictionary of English v.0.48

signal \sig"nal\, a. from signal, n.: cf. f. signal'e.
   1. noticeable; distinguished from what is ordinary; eminent;
      remarkable; memorable; as, a signal exploit; a signal
      service; a signal act of benevolence.
      1913 webster

            as signal now in low, dejected state
            as erst in highest, behold him where he lies.
                                                  --milton.
      1913 webster

   2. of or pertaining to signals, or the use of signals in
      conveying information; as, a signal flag or officer.
      1913 webster

   the signal service, a bureau of the government in the
      united states connected with the war department organized
      to collect from the whole country simultaneous raports of
      local meteorological conditions, upon comparison of which
      at the central office, predictions concerning the weather
      are telegraphed to various sections, where they are made
      known by signals publicly displayed.

   signal station, the place where a signal is displayed;
      specifically, an observation office of the signal service.
      1913 webster

   syn: eminent; remarkable; memorable; extraordinary; notable;
        conspicuous.
        1913 webster
see also:
the signal service signal station 

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